<!DOCTYPE html>
<html lang="en" style="font-size: 0.5em">
<head>
	<meta charset="UTF-8">
	<title>C004_CSS属性和值</title>
</head>
<body style="font-size: 32px">

<p style="font-size: 16px">hello</p>
<p style="font-size: 2em">hello</p>
<p style="font-size: 50%">hello</p>
<p style="font-size: 1rem">hello</p>

</body>
</html>